The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles due to difference of density caused by temperature of the particle is known as

A Conduction
B Free convection
C Forced convection
D Radiation

Correct Answer: Free convection

Free convection heat transfer is the transfer of heat due to movement of liquid and air molecules without external source such as a pump or fan.
It occurs due to forces generated by density differences caused by temperature difference.
Bissoy MCQ
#Mechanical Engineering #Heat And Mass Transfer

Related Questions

The process of heat transfer from one particle of the fluid to another by the actual movement of the fluid particles caused by some mechanical means, is known as
A Conduction
B Free convection
C Forced convection
D Radiation
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by
A Conduction
B Convection
C Radiation
D Conduction and convection
The process of heat transfer from one particle of the body to another by the actual motion of the heated particles, is called
A Conduction
B Convection
C Radiation
D None of these
The scales form in heat exchanges after a period of operation and provide additional resistance to heat transfer with some heat transfer coefficient . The reciprocal of this scale heat transfer coefficient is called .
A scaling factor
B forming factor
C resisting factor
D fouling factor
Extended heat transfer surface like fins are used to increase the heat transfer rate. Fin efficiency is defined as the ratio of heat transferred across the fin surface to the theoretical heat transfer across an equal area held at the
A Surrounding temperature
B Average temperature of the fin
C Temperature of the fin end
D Constant temperature equal to that of the base
The process of heat transfer from one particle of the body to another is called conduction, when the particles of the body
A Move actually
B Do not move actually
C Affect the intervening medium
D Does not affect the intervening medium
The rate of heat transfer is a product of overall heat transfer co-efficient, the difference in temperature and the
A Heating volume
B Heat transfer area
C Nusselt number
D None of these
For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
A Film diffusion
B Diffusion through ash layer
C Chemical reaction
D Either A, B or C
For the non-catalytic reaction of particles with surrounding fluid, the time needed to achieve the same fractional conversion for particles of different but unchanging sizes is proportional to the square of particle diameter, when the __________ is the controlling resistance.
A Film diffusion
B Diffusion through ash layer
C Chemical reaction
D Either A, B or C
In a heat exchanger, the rate of heat transfer from the hot fluid to the cold fluid
A Varies directly as the area and the LMTD
B Directly proportional to LMTD and inversely proportional to the area
C Varies as square of the area
D None of these

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